Apparatus for detachable attachment of an electrical conductor to a current transformer housing

A method for detachably fastening a current conductor to a current transformer housing, wherein the current transformer housing has an opening and the conductor is guided through the opening, using a retaining element and/or using a fastening element, comprising the current transformer housing, the retaining element that is guided through a throughhole of the current transformer housing, the retaining element passing through the throughhole along a longitudinal axis extending in direction towards and away from the current conductor, and the fastening element that is guided through the retaining element, wherein

• the fastening element and/or the retaining element are seated against at least some regions of the surface of the current conductor when the current conductor is fastened to the device, and
• wherein the retaining element comprises:
• a first region having a substantially planar surface that extends along the longitudinal axis of the retaining element, the first region corresponding to a first rotational position of the retaining element,
• a second region having tongue-and-groove like surfaces that engage with surfaces of the throughhole, the second region corresponding to a second rotational position of the retaining element, and
• the retaining element can be rotated in a rotatory manner about the longitudinal axis thereof from a first rotational position into a second rotational position, comprising the following steps:
• in the first rotational position, displacing the retaining element in a translatory manner along the longitudinal axis thereof toward the current conductor;
• rotating the retaining element into the second rotational position, wherein in the second rotational position the retaining element cannot be displaced in a translatory manner along the longitudinal axis thereof;
• and
• rotating the fastening element in a rotatory manner about the longitudinal axis thereof toward the current conductor to fasten the current conductor.

A device for detachably fastening a current conductor to a current transformer housing, the device comprising:

• the current transformer housing, wherein the current transformer housing has an opening and the conductor is guided through the opening,
• a receiving element that is arranged on the current transformer housing, and which is detachably fastened to the current transformer housing,
• a retaining element that is guided through a throughhole of the receiving element, the retaining element passing through the throughhole along a longitudinal axis extending in direction towards and away from the current conductor, and
• a fastening element that is guided through the retaining element, wherein the fastening element and/or the retaining element are seated against at least some regions of the surface of the current conductor when the current conductor is fastened to the device,
• wherein the fastening element can be rotated in a rotatory manner about the longitudinal axis thereof so as to fasten or detach the current conductor,
• wherein the retaining element comprises:
• a first region having a substantially planar surface that extends along the longitudinal axis of the retaining element, the first region corresponding to a first rotational position of the retaining element,
• a second region having tongue-and-groove like surfaces that engage with surfaces of the throughhole, the second region corresponding to a second rotational position of the retaining element, and
• wherein the retaining element can be rotated in a rotatory manner about the longitudinal axis thereof between the first rotational position and in the second rotational position, wherein the retaining element, in the first rotational position, can be displaced in a translatory manner along the longitudinal axis thereof so as to fasten or release the current conductor, and in the second rotational position, the retaining element cannot be displaced in a translatory manner along the longitudinal axis thereof.